后注浆静压复合桩在复杂运营供水结构加固中的应用  

Application of post-grouting static-pressure composite pile in complex operation water supply structure

作　　者：张超哲 童立元[1] 刘松玉[1] 韩健勇 余巍 Zhang Chaozhe;Tong Liyuan;Liu Songyu;Han Jianyong;Yu Wei(Institute of Geotechnical Engineering,Southeast University,Nanjing 211189,China;School of Civil Engineering,Shandong Jianzhu University,Jinan 250101,China;Nanjing SEU Geotechnical Engineering Investigation and Design Research Institute Co.,Ltd.,Nanjing 210000,China)

机构地区：[1]东南大学岩土工程研究所,南京211189 [2]山东建筑大学土木工程学院,济南250101 [3]南京东大岩土工程勘察设计研究院有限公司,南京210000

出　　处：《东南大学学报（自然科学版）》2021年第1期46-52,共7页Journal of Southeast University：Natural Science Edition

基　　金：国家自然科学基金资助项目(51878157);江苏省自然科学基金资助项目(BK20181282).

摘　　要：为解决既有建构筑物地基基础加固工程所面临的施工条件有限、工期紧张以及沉降控制严格等问题,基于南京某复杂运营供水结构加固工程,提出了一种后注浆静压复合桩(PSCP)加固技术.采用数值分析的方法,结合现场观测数据,对加固过程和长期沉降进行评价,并对比分析了桩长、桩径、反力梁高度等参数对加固效果的影响.结果表明:PSCP桩具有施工扰动小和适应于狭小施工场地作业的特点,施工引起的地表沉降增量在3.2 mm以内;增加桩径,地表最大沉降量可减小6.84%;桩长和加固梁高度的增加对加固效果影响不明显,地表最大沉降量仅减小2.91%和1.39%;工后沉降趋于稳定,该加固技术在加固工程中具有良好的适用性.To solve the problems of limited construction conditions,tight construction period and strict settlement control of existing building foundation reinforcement projects,a post-grouting static-pressure composite pile(PSCP)reinforcement technology was proposed based on a reinforcement project for a complex operating water supply structure in Nanjing.The reinforcement process and long-term settlement were evaluated by numerical analysis based on the field observation data.The influence of the pile length,the pile diameter and the reaction beam height on the reinforcement effect was compared and analyzed.The results show that the PSCP piles have the characteristics of less construction disturbance and adaptability to operation in a narrow construction site.The increment of the surface subsidence caused by construction is within 3.2 mm.The increase of the pile diameter can reduce the maximum surface settlement by 6.84%.The increase of the pile length and the reinforced beam height has no obvious effect on the reinforcement effect,and the maximum settlement amount is only reduced by 2.91%and 1.39%,respectively.The settlement after construction tends to be stable,and this technology has good applicability in reinforcement projects.

关 键 词：既有结构 复合桩 沉降控制 地基基础加固 数值分析 

分 类 号：TU473[建筑科学—结构工程]